Coffee, a hot drink made from the roasted beans (seeds) of the coffee tree. Coffee is a popular beverage in North America, commonly consumed at breakfast or during the morning "coffee break" at work. It contains 1 to 2 per cent caffeine, a substance that stimulates the central nervous system. Caffeine increases wakefulness and alertness, but excessive amounts can cause a number of unpleasant symptoms. Persons who regularly drink more than five cups of coffee daily may experience withdrawal symptoms if they stop drinking it.
You Might Also Like
Plants that eat other creatures? It sounds like a genetic experiment gone awry. But there's actually nothing unnatural about it; carnivorous plants have been around for thousands of years. Find out all about the Venus Flytrap.
Pollen grains are, in essence, plant sperm. But how do the grains get where they need to go, and what's the advantage of trusting your genetic future to the winds?